So I gave had an issue since the weather got warm that my car will not start after I have driven it around for a bit in the heat, if it sits for over 20 minutes there is no problem but if I jump out and back in it has to sit and cool down before it will start. I took it in to Ford they refused to check it the first time as by the time it got there it was working, I finally got them to check it a few days later and was told it was the spark plugs and wiring, so I changed all that but than a week later it started again I took it in for an oil change and asked the mechanics at speedy if they could diagnose the problem and they told me it was the battery, so I changed the battery, now however it is still acting up when hot.. anyone have any ideas?? oh and when it won't start it still cranks and acts like it will start but won't. (I've checked all the fuses, and hooked and ODB reader and it came back with no errors)

 

That's a crap shoot. It could be so many different things that I can only suggest to do things that don't cost anything or not much.
For example clean and put back in place:
MAF sensor
throttle body
EGR valve
ECT sensor (engine coolant temperature sensor)
check coil pack for corrosion etc
use a quality fuel system cleaner for a tank or two

You don't get any readings because things are not bad enough yet.

Good luck